Glossary Of Water Treatment
Industry Terms . . . "L"
laminar flow- The
flow of fluid in which the flow paths are in smooth, parallel lines,
with essentially no mixing and no turbulence.
Langelier's Index - A
calculated number used to predict whether or not a water will precipitate,
be in equilibrium with, or dissolve calcium carbonate. It is sometimes
erroneously assumed that any water which tends to dissolve calcium carbonate
is automatically corrosive.
LAS - Abbreviation for "Linear
leakage- The presence
of a consistent concentration of ions in the effluent of an ion exchange
system due to incomplete removal of the ions; caused by incomplete regeneration,
excessive flow rates, low temperatures, the concentration or characteristics
of the influent ions, or other factors. (See hardness leakage.)
lime- The common name for
calcium oxide (CAO); hydrated lime is calcium hydroxide, Ca(OH)2.
lime scale- Hard water
scale containing a high percentage of calcium carbonate.
limestone - A sedimentary
rock, largely calcium carbonate, and usually also containing significant
amounts of magnesium carbonate.
linear alkyl sulfonate
- A term applied to a family of straight chain chemical compounds,
widely used as detergents; sometimes called "soft" detergents
because they are more readily degraded to simpler substances by biological
action than the previously used alkyl benzene sulfonate. (See detergent,
alkyl benzene sulfonate.)
liter- The basic metric unit of volume; 3.785 liters equal 1 U.S. gallon; 1 liter of water weighs 1000 grams.